heat wave the next few days. >> thanks, leigh. >>> the first debate betweenpresidentobamaandthe republican challenger mitt romney is just four days from now. karen travers reports what they are both doing for the showdown. >> they were out of the public eye as they get ready for their first debate this wednesday. there will be campaign duties to their running mate. biden stumped in florida for a second consecutive day. he slammed the bush administration for the budget deficit. >> they had doubled the national debt in eight years. >> with his path to the white house shrinking, florida you is looking like a must win scenario for romney. but today paul ryan focused on new hampshire. the granite state has four electoral votes, but ryan said that could be the difference in a race that will come down to a handful of states. >> thank you, granite staters, for sending mitt romney to the white house and barack obama back to chicago. >> the campaign shifts to a different stage with wednesday night's high stakes showdown between president obama and romney. >> if you take a look at